[GreenKeys] Model 15 troubleshooting

[Jon Schlegel]

Another thought - If you repeatedly key the same single character, is 
the character printed constant or does it change with the reception 
of each character.

Yet another thought - "Divide and Conquer": Is it possible there's 
something wrong with the keyboard?  Do you have another machine you 
can use to generate a known good signal?

Jon
WA3MVM


At 02:54 PM 1/30/2009 -0500, Larry Tighe wrote:
>What's the numbers on the motor pinion and shaft gear?
>
>lar
>----- Original Message -----
>From: "John Nagle" <nagle at animats.com>
>To: <greenkeys at mailman.qth.net>
>Sent: Friday, January 30, 2009 14:45
>Subject: [GreenKeys] Model 15 troubleshooting
>
>
> >    OK, I have my model 15 oiled, powered, and connected with
> > keyboard and printer in series.  It runs, but won't type correctly.
> > Not even close.
> >
> >    First, this is a "clean" model 15; there's no sign of damage
> > or nonstandard modifications.  It was just in storage for a long
> > time, and the lubricants had gunked up.  I've cleaned it by
> > immersion in Simple Green, and oiled it per the manual, using
> > 5W-20 Valvoline synthetic, with lithium grease on the gears and
> > big sliding parts.  Small oiling points were oiled with a one-drop
> > precision oiler.  Everything runs, and reasonably quietly.
> >
> >    Loop power is 120VDC regulated, through a resistor just under 2K.
> > The selector magnet has a 55 ohm resistance, and loop current was
> > measured at 60.4 mA.  The selector magnet ("pulling" type)
> > seems to be pulling in correctly.
> >
> >    But the selector magnet seems to be "slow", like it can't keep
> > up with the incoming bit stream.  RYRYRY doesn't bring up alternating
> > code bars.  It's as if the selector magnet can only keep up with
> > about half the bit rate.  (The machine seems to be running at standard
> > speed; it's not like somebody put in 100WPM gears or something.)
> >
> >    The selector magnet faces are clean of oil, the selector magnet
> > moves freely, and all the obvious stuff seems OK.  The swords
> > and everything downstream from there seems fine.   I've de-gunked
> > and carefully oiled everything in that area, and it doesn't help.
> > Adjusting the range finder has little effect.
> >
> >    Am I missing anything obvious?
> >
> > John Nagle
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> > GreenKeys at mailman.qth.net
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